General description Flange head, cross-recessed black zinc plate self-tapping screws designed for various applications. These screws feature a Pozi Pan drive and are ideal for use in materials that require a secure fastening. Technical specifications Type: C (AB) case hardened steel Size: No.6 x 1" (3.5mm x 25mm) Quantity: 200 pieces Finish: Black zinc plate Standard: BS 4174 CZ